A poster/art website going by the name of Dark Hall Mansion has been poked by Hasbro to make some official holiday posters for Friendship is Magic. Both of them appear to be using a mixture of the stock vectors that we usually see on merchandise (Rainbow Dash on the bottom one for example), as well as a few new ones. Both of them were annoucned on their Facebook Page a few days ago.
If you would like a set, head on over to their website. On Friday (December 7th), a paypal "add to cart" button will pop up for purchases. I'll toss a reminder out when the time comes!
Thanks to the swarms of people that sent them in!